<template>
  <div class="tags" v-if="showTags">
    <el-tag
        v-show="false"
        v-for="tag in tags"
        :key="tag.name"
        closable
        :type="tag.type">
      {{tag.name}}
    </el-tag>
    <ul v-show="true">
      <li
          class="tags-li"
          v-for="(item,index) in tabsList"
          :class="{'active': isActive(item.path)}"
          :key="index"
      >
        <router-link :to="item.path" class="tags-li-title">{{item.title}}</router-link>
        <span class="tags-li-icon" @click="closeTags(index)" style="height: 60px">
          <i class="el-icon-close"></i>
        </span>
        <router-view></router-view>
      </li>
    </ul>
    <!-- 其他操作按钮 -->
    <div class="tags-close-box">
      <el-dropdown @command="handleTabs">
        <el-button size="mini">
          <i class="el-icon-arrow-down el-icon--right">操作</i>
        </el-button>
        <el-dropdown-menu size="small" slot="dropdown">
          <el-dropdown-item command="other">关闭其他</el-dropdown-item>
          <el-dropdown-item command="all">关闭所有</el-dropdown-item>
        </el-dropdown-menu>
      </el-dropdown>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      tags: [
        { name: '标签一', type: '' },
        { name: '标签二', type: 'success' },
        { name: '标签三', type: 'info' },
        { name: '标签四', type: 'warning' },
        { name: '标签五', type: 'danger' }
      ],
      tabsList: [
        {
          path:'/oos/test1/me',
          name:'',
          title:'设备'
        }
      ]
    };
  },
  computed: {
    showTags() {
      return this.tabsList.length > 0;
    }
  },
  watch: {
    // 对router进行监听，每当访问router时，对tags的进行修改
    $route(newValue) {
      this.setTags(newValue);
    }
  },
  created() {
    // 第一次进入页面时，修改tag的值
    this.setTags(this.$route);
  },
  methods: {
    isActive(path) {
      return path === this.$route.fullPath;
    },
    // 关闭单个标签
    closeTags(index) {
      const delItem = this.tabsList.splice(index, 1)[0];
      const item = this.tabsList[index]
          ? this.tabsList[index]
          : this.tabsList[index - 1];
      if (item) {
        delItem.path === this.$route.fullPath && this.$router.push(item.path);
      } else {
        this.$router.push("/");
      }
    },
    // 关闭全部标签
    closeAll() {
      this.tabsList = [];
      this.$router.push("/");
    },
    // 关闭其他标签
    closeOther() {
      const curItem = this.tabsList.filter(item => {
        return item.path === this.$route.fullPath;
      });
      this.tabsList = curItem;
    },
    // 设置标签
    setTags(route) {
      const isExist = this.tabsList.some(item => {
        return item.path === route.fullPath;
      });
      !isExist &&
      this.tabsList.push({
        title: route.meta.title,
        path: route.fullPath,
        name: route.matched[1].components.default.name
      });
    },
    // 当关闭所有页面时隐藏
    handleTabs(command) {
      command === "other" ? this.closeOther() : this.closeAll();
    }
  }
};
</script>


<style>
.tags {
  position: relative;
  overflow: hidden;
  background: #fff;
  padding-right: 120px;
}

.tags ul {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
}

.tags-li {
  float: left;
  margin: 3px 5px 2px 3px;
  border-radius: 3px;
  font-size: 12px;
  overflow: hidden;
  cursor: pointer;
  height: 23px;
  line-height: 23px;
  border: 1px solid #e9eaec;
  background: #fff;
  padding: 0 5px 0 12px;
  vertical-align: middle;
  color: #666;
  -webkit-transition: all 0.3s ease-in;
  -moz-transition: all 0.3s ease-in;
  transition: all 0.3s ease-in;
}

.tags-li:not(.active):hover {
  background: #f8f8f8;
}

.tags-li-title {
  float: left;
  max-width: 80px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  margin-right: 5px;
  color: #666;
}

.tags-li.active {
  color: #fff;
  border: 1px solid #10b9d3;
  background-color: #10b9d3;
}

.tags-li.active .tags-li-title {
  color: #fff;
}

.tags-close-box {
  position: fixed;
  right: 36px;
  top: 76px;
  background: #333;
  box-sizing: border-box;
  padding-top: 1px;
  text-align: center;
  z-index: 10;
}
</style>